People are generally aware of the most common causes of hallucinations, like schizophrenia and a really high fever. But lesser known are the more rare causes; here are six you probably haven't heard about.

The Cologne court ruling in June outraged Germany's Muslims and Jews, and triggered an anguished national debate, by stating that ritual circumcision of under-aged boys amounted to "bodily harm" and parents should wait for their son to make his own decision.